Array
(
    [1536x1536] => Array
        (
            [width] => 1536
            [height] => 1536
            [crop] => 
        )

    [2048x2048] => Array
        (
            [width] => 2048
            [height] => 2048
            [crop] => 
        )

    [post-thumbnail] => Array
        (
            [width] => 66
            [height] => 66
            [crop] => 1
        )

    [recent-post-thumbnail] => Array
        (
            [width] => 600
            [height] => 240
            [crop] => 1
        )

    [woocommerce_thumbnail] => Array
        (
            [width] => 150
            [height] => 150
            [crop] => 1
        )

    [woocommerce_single] => Array
        (
            [width] => 300
            [height] => 0
            [crop] => 0
        )

    [woocommerce_gallery_thumbnail] => Array
        (
            [width] => 100
            [height] => 100
            [crop] => 1
        )

    [shop_catalog] => Array
        (
            [width] => 150
            [height] => 150
            [crop] => 1
        )

    [shop_single] => Array
        (
            [width] => 300
            [height] => 0
            [crop] => 0
        )

    [shop_thumbnail] => Array
        (
            [width] => 100
            [height] => 100
            [crop] => 1
        )

)